Have you ever try to bath with her together? She may looking for the security of adult, try to bath with her one week and read more story book about this topic (easy to find in public library). Ask some of her friends or relative come and bath with her too....this is the most effective ways to help children. Learning from same age is the most effective way for children to learn. Hope I can help you since I am studying in master in children education. IF you still have problem, feel free to ask me.